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You know guys, I have been thinking that staying in an underground bunker during a purely militant SHTF event, would make me feel like a rabbit in a hole just waiting to be blown out of there. I...

I think you could put a small I beam header across the end where the door is located, runa beam down the middle, and a couple of beams from the floor up to the beam, ( mid supports ), and as narrow...

Well you could reinforce them pretty cheap, and if you poured concrete with rebar over the top, that would take a lot of the weight. I think it could be done!